Load distribution for surgical implants

Abstract

A femoral stem device is described herein comprising a stem and a neck, wherein the stem comprises an outer shell, wherein the stem comprises a proximal region and a distal region, wherein an interior of the proximal region is selectively hollowed, wherein a loading of the device comprises deforming laterally disposed walls of the proximal region outer shell.

1 . A femoral stem device comprising,
 a stem and a neck, wherein the stem comprises an outer shell, wherein the stem comprises a proximal region and a distal region, wherein an interior of the proximal region is selectively hollowed, wherein a loading of the device comprises deforming laterally disposed walls of the proximal region outer shell.   
     
     
         2 . The femoral stem device of  claim 1 , wherein the deforming comprises lateral deformation of the walls adjacent to the selectively hollowed spaces. 
     
     
         3 . The femoral stem device of  claim 1 , wherein the selective hollowing comprises an entire hollowing of the proximal region interior. 
     
     
         4 . The femoral stem device of  claim 1 , wherein the selective hollowing comprises a partial hollowing of the proximal region interior. 
     
     
         5 . The femoral stem device of  claim 4 , wherein the partial hollowing provides a curved central spine. 
     
     
         6 . The femoral stem device of  claim 5 , wherein the curved central spine is aligned with a curved longitudinal axis of the stem proximal region. 
     
     
         7 . The femoral stem device of  claim 4 , wherein the partial hollowing comprises beams laterally extending from the central spine. 
     
     
         8 . The femoral stem device of  claim 7 , wherein the central spine and beams define a series of intervening hollowed spaces. 
     
     
         9 . The femoral stem device of  claim 8 , wherein the intervening hollowed spaces comprise laterally opposed internal surfaces. 
     
     
         10 . The femoral stem device of  claim 8 , wherein the intervening hollowed spaces comprise longitudinally opposed internal surfaces. 
     
     
         11 . The femoral stem device of  claim 1 , wherein the deformation transfers at least a portion of the loading into a femur. 
     
     
         12 . The femoral stem device of  claim 1 , wherein the walls comprise a width of 2 mm. 
     
     
         13 . The femoral stem device of  claim 1 , wherein the stem is configured for implantation into a femur. 
     
     
         14 . The femoral stem device of  claim 1 , wherein the distal region of the stem is solid. 
     
     
         15 . The femoral stem device of  claim 14 , wherein the solid stem is partially hollowed to provide a channel for removal of unfused alloy powder. 
     
     
         16 . The femoral stem device of  claim 1 , wherein the neck is configured for attachment to a femoral head. 
     
     
         17 . The femoral stem device of  claim 1 , wherein the femoral stem device comprises Titanium grade 5 (Ti-6Al-4V).